An LED power transmission line with load identification function is coupled to an LED power control apparatus having a plurality of power output ports and an LED load. The LED power transmission line includes a power transmission circuit, a signal transmission circuit, and a memory apparatus. The power transmission circuit transmits a power outputted from the power output port to the LED load. The signal transmission circuit is coupled to a control module of the LED power apparatus through the power output port. The memory apparatus stores an LED specification information related to an electrical specification of the LED load. The LED specification information is provided to the control module through the signal transmission circuit so that the control module limits an output current outputted from the power output port according to the LED specification information.

An LED light fixture for a hazardous location includes an axially elongated enclosure fabricated from a glassfiber reinforced plastic material, at least one axially elongated linear light emitting diode (LED) module mounted in the enclosure, and an LED driver module mounted in the housing that operates the at least one linear light emitting diode. The LED driver module and the at least one axially elongated linear LED module are operable within a target peak temperature limit for the hazardous location, without utilizing heat sinks to dissipate heat in order to provide acceptable thermal management.

An LED light fixture for a hazardous location includes an axially elongated enclosure fabricated from a glassfiber reinforced plastic material, at least one axially elongated linear light emitting diode (LED) module mounted in the enclosure, and an LED driver module mounted in the housing that operates the at least one linear light emitting diode. The LED driver module and the at least one axially elongated linear LED module are operable within a target peak temperature limit for the hazardous location, without utilizing heat sinks to dissipate heat in order to provide acceptable thermal management.

A lighting system includes two or more lighting fixtures, each comprising a housing, at least one light source mechanically supported by the housing, at least one pipe thermally coupled to the housing to carry a fluid coolant, an AC power port, and at least one network communications port. The AC power ports of respective lighting fixtures are coupled together with a plurality of industrial power cables without using one or more conduits for the plurality of industrial power cables. The network communications ports of the respective lighting fixtures are coupled together with a plurality of waterproof network communications cables. In one example, a lighting system kit comprises two or more lighting fixtures having an AC power port comprising an industrial type connector. The kit further comprises multiple industrial power cables and one or more industrial drop tee cables.

A lighting system includes two or more lighting fixtures, each comprising a housing, at least one light source mechanically supported by the housing, at least one pipe thermally coupled to the housing to carry a fluid coolant, an AC power port, and at least one network communications port. The AC power ports of respective lighting fixtures are coupled together with a plurality of industrial power cables without using one or more conduits for the plurality of industrial power cables. The network communications ports of the respective lighting fixtures are coupled together with a plurality of waterproof network communications cables. In one example, a lighting system kit comprises two or more lighting fixtures having an AC power port comprising an industrial type connector. The kit further comprises multiple industrial power cables and one or more industrial drop tee cables.

An LED tube lamp comprises a heat-dissipating glass lamp tube, protective film attached to a surface of the glass lamp tube, an LED light strip disposed in the glass lamp tube and two end caps, each of the two end caps coupled to a respective end of the glass lamp tube. The LED light strip comprises a substantially flat LED circuit board and a plurality of LED light sources, the LED circuit board comprises a top surface and a base surface, and the plurality of LED light sources mounted on the top surface and the base surface are directly affixed to a curved inner surface of the glass lamp tube. A non-insulating adhesive layer is disposed between the base surface of the LED circuit board and the curved inner surface of the glass lamp tube and extends along a length of the LED light strip. The LED circuit board comprises a first end electrically connecting to a first connector and a second end electrically connecting to a second connector, wherein the first connector and the second connector are connectable to a light fixture through the end caps. The inner space of the glass lamp tube comprises ambient atmosphere. The plurality of LED light sources emit white light. The diameter of the lamp tube is ⅝ inch or 1 inch and a length of the glass lamp tube is 2 ft, 4 ft or 8 ft.

Systems and methods are provided to transmit a data encoded power signal to addressable devices. A lighting controller sends the data encoded power waveform to a plurality of addressable lighting modules to power and control a behavior of the lighting modules. An inventory function causes the lighting controller to send, one by one, each of the possible unique addresses, or for a particular range of addresses, a command to turn ON lighting modules. The lighting controller monitors the current draw of the power supply or the data encoded power waveform and compares the monitored current with a threshold to determine whether the addressed lighting module responded to the command. The lighting controller provides the user, via a user interface, a list of the responding lighting modules based on the comparison.

A lighting assembly that includes a heatsink housing, a plurality of light emitting diode (LED) modules, and a power supply disposed within a power supply casing, wherein the power supply is for providing power to the LED modules. Each LED module includes a plurality of LEDs and is thermally connected to the heatsink housing. The power supply casing includes a structure for cooling the power supply.

A lighting assembly that includes a heatsink housing, a plurality of light emitting diode (LED) modules, and a power supply disposed within a power supply casing, wherein the power supply is for providing power to the LED modules. Each LED module includes a plurality of LEDs and is thermally connected to the heatsink housing. The power supply casing includes a structure for cooling the power supply.

A lighting circuit turns on multiple semiconductor light sources. Multiple current sources are each coupled in series with a corresponding one from among the semiconductor light sources. A switching converter supplies a driving voltage V.sub.OUT across each of multiple series connection circuits formed of the multiple semiconductor light sources and the multiple current sources. A converter controller controls a switching transistor of the switching converter based on a relation between a voltage across one from among the multiple current sources and a reference voltage having a positive correlation with the temperature T.sub.j.